Special tungsten-containing nano titanium dioxide for flue gas denitration catalyst and manufacturing method thereof

A denitration catalyst and nano-titanium dioxide technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as poor storage, pollute the environment, and have high toxicity, achieve easy operation, and improve the ratio. Surface area, the effect of enhancing surface acidity

Active Publication Date: 2012-04-18
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the NO produced by the decomposition of nitric acid 2 It is highly toxic and seriously pollutes the environment, and nitric acid and barium carbonate are also dangerous goods, which are not easy to store

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The metatitanic acid prepared by the sulfuric acid method is washed with deionized water to remove impurities, so that the iron ion, alkali metal ion and various heavy metal ions in the metatitanic acid are less than 100ppm. Weigh 332kgTiO 2 Metatitanic acid slurry, add deionized water, configure TiO 2 20% metatitanic acid slurry. Transfer the slurry to the mixer, add 17.5kg of activated carbon, after fully stirring, add 22kg of sulfuric acid and 20.3kg of ammonium paratungstate, after stirring for 1 hour, transfer to the diaphragm filter press (solid content is about 55%) and transfer to the rotary In the kiln, dry and roast from 70°C to 615°C at a heating rate of 30°C / hour to obtain tungsten-added nano-titanium dioxide specially used for denitrification catalysts, and its SO 4 2- The content is 2.4%, WO 3 The content is 5%, the rest is TiO 2 , the content is 92.6%; the average crystal particle size is 23nm, and the BET specific surface area is 85M 2 / g.

Embodiment 2

[0023] Do not add active carbon, other conditions are consistent with embodiment 1, obtain the denitrification catalyst specially added tungsten-type nano-titanium dioxide, its SO 4 2- The content is 2.4%, WO 3 The content is 5%, the rest is TiO 2 , the content is 92.6%; the average crystal particle size is 23nm, and the BET specific surface area is 75M 2 / g.

Embodiment 3

[0025] WO in embodiment 1 3 The content is adjusted to 10%, and other conditions are consistent with that of Example 1, so that the denitrification catalyst plus tungsten-type nano-titanium dioxide is obtained, and its SO 4 2- The content is 2.4%, WO 3 The content is 10%, the rest is TiO 2 , the content is 87.6%; the average crystal particle size is 21nm, and the BET specific surface area is 88M 2 / g.

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Abstract

The invention provides high-performance special tungsten-containing nano titanium dioxide for a flue gas denitration catalyst and a preparation method thereof. The nano titanium dioxide comprises the following ingredients by mass percentage: 85-96.2 percent of TiO2, 3-10 percent of WO3 and 0.8-5 percent of SO42-. The preparation method comprises: using metatitanic acid prepared in a sulfuric acidmethod as a raw material, adding a pore-forming agent, mixing, adding precursors of ammonium paratungstate and sulfate radical, mixing, and delivering the mixture to a rotary kiln for drying and roasting to obtain the nano titanium dioxide with a large specific surface and high surface acidity. Compared with the prior art, the invention has the following advantage that: (1) since the sulfuric acid is added, the surface acidity of TiO2 is significantly enhanced, and the denitration activity of the final catalyst is improved; (2) since the ammonium paratungstate is added into the metatitanic acid solution, the performance of titanium dioxide is improved, the process is simple, and the operation is facilitated; (3) the procedures are simple, the drying and roasting are completed in the rotary kiln, the number of devices is reduced, and the energy consumption is decreased; and (4) the specific surface area of the titanium dioxide is increased through the pore-forming agent, and the applied pore-forming agent is inexpensive and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a tungsten-added nano-titanium dioxide specially used for a flue gas denitrification catalyst and a manufacturing method thereof. technical background [0002] The nitrogen oxides generated by coal combustion are mainly nitric oxide (accounting for 95% of the total nitrogen oxides) and nitrogen dioxide (accounting for 5% of the total nitrogen oxides), which are very toxic to humans and damage plants. Formation of photochemical smog and acid rain. With the continuous and rapid development of my country's economy, the consumption of coal resources is increasing, and the emission of NOx in the atmosphere is also increasing rapidly, which has constituted a huge threat to the ecological environment and people's health. The country is about to issue a mandatory denitrification policy for industrial furnaces such as power plants, steel plants, and glass plants. [0003] NH f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01D53/86B01D53/56
Inventor 陈金发冯自平
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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